This video is about compressed air cans (aka gas dusters) and why they get cold when you spray them. They cool off because the refrigerant inside (1,1-difluoroethane) is under pressure and boils off when the pressure lowers, and energy lost to the latent heat of vaporization cools the can a lot. Difluoroethane normally boils at -25°C (-13°F), but under ~6 atm (6 bar, 600 kpa) it is a liquid at room temperature. The gas also cools off slightly due to the Joule-Thompson effect of fluid expansion through a throttled valve. Difluoroethane is heavier than air and water soluble, so it is recommended to use it in a ventilated environment to clean your keyboard, etc. Also, 1,1-difluoroethane is a potent greenhouse gas. It is also known as Freon 152a, Ethylidene difluoride, Ethylidene fluoride, HFC-152a, R-152a, and DFE.
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Mark Rober's youtube channel: https://www.youtube.com/markrober
This video is chapter 6 in my series on special relativity, and it covers the topic of relativistic addition of velocity: aka, how things that are moving relative to one inertial reference frame, which is moving relative to another reference frame, what speed or velocity are those things moving relative to the second frame. We'll show this using the Lorentz transformation of moving worldlines, enacted with a mechanical minkowski diagram, aka mechanical Lorentz transformation, aka spacetime globe.
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https://www.youtube.com/watch?v=R5oCXHWEL9A
My open letter to the universe.
Also, explore a map of the big bang! http://www.bigbangregistry.com
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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
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https://www.youtube.com/watch?v=wN39H1Eb-6I
How do you know when you've "discovered" a particle? What do we mean by "discovery"? Also, explore a map of the big bang! http://www.bigbangregistry.com
MinutePhysics is on Google+ - http://bit.ly/qzEwc6
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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Music by Nathaniel Schroeder
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https://www.youtube.com/watch?v=6guXMfg88Z8
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Einstein didn't like quantum mechanics because it wasn't able to make perfect predictions... but science is not about what you like, it's about what's true!
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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Music by Nathaniel Schroeder http://www.soundcloud.com/drschroeder
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https://www.youtube.com/watch?v=dmX1W5umC1c
Pianos can't be perfectly tuned - it's a mathematical fact!
Thanks to http://www.audible.com/minutephysics for supporting MinutePhysics.
Equal tempered tuning: https://en.wikipedia.org/wiki/Equal_temperament
Just Tuning: https://en.wikipedia.org/wiki/Just_intonation
Harmonics: https://en.wikipedia.org/wiki/Harmonic
Pythagorean vs Just Tuning: https://www.youtube.com/watch?v=QaYOwIIvgHg
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https://www.youtube.com/watch?v=1Hqm0dYKUx4
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Mark Rober's youtube channel: https://www.youtube.com/markrober
This video is chapter 7 in my series on special relativity, and it covers the idea that some things AREN'T relative: there IS a sense of absolute length and absolute time, which can be agreed upon from all moving perspectives (as long as they're inertial reference frames). In particular, proper length and proper time, aka the spacetime interval. Essentially, this is the spacetime version of the pythagorean theorem, and we'll explore it using the Lorentz transformations of lengths and time intervals, enacted with a mechanical minkowski diagram, aka mechanical Lorentz transformation, aka spacetime globe.
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https://www.youtube.com/watch?v=WFAEHKAR5hU
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References
Non-Equilibrium Pilot Wave model: http://arxiv.org/pdf/0811.0810.pdf AND http://arxiv.org/pdf/1001.2758.pdf
Real Ensemble Interpretation: http://arxiv.org/pdf/1104.2822.pdf
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https://www.youtube.com/watch?v=KNwKPfOKipk
Check out the "What is a Day?" interactive video at https://labs.minutelabs.io/what-is-a-day/
It's super cool!! (and made by Jasper Palfree & the MinuteEarth/MinutePhysics team)
The MinutePhysics video about Why December Has the Longest Days: https://www.youtube.com/watch?v=nZMMuv0Ltyo
This video is about the length of a solar day vs a stellar day vs a mean standard day, what they all have to do with each other and the earth's orbit, eccentricity, axial tilt, and so on. Also, aliens and asteroids. It'll explain the equation of time, and why the longest day is in December. The lab will also show you what days are like on all the other planets - Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and even - though it's not a planet - Pluto.
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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Created by Henry Reich
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https://www.youtube.com/watch?v=Vxz6nNqpDCk
This video made possible with support of Brilliant - the first 200 subscribers to go to http://Brilliant.org/MinutePhysics get 20% off a Premium subscription to Brilliant.
Go to http://aatishb.com/covidtrends to see the interactive graph
RESOURCES
Grant's 3Blue1Brown Video: Exponential Growth and Epidemics: https://www.youtube.com/watch?v=Kas0tIxDvrg
Aatish's Exponential/Logistic Curve-Fitting Site: https://github.com/aatishb/covid/blob/master/curvefit.ipynb
Data Source: https://github.com/CSSEGISandData/COVID-19
Our World in Data Page on Coronavirus: https://ourworldindata.org/coronavirus
How many tests for COVID-19 are being performed around the world? https://ourworldindata.org/covid-testing
Understanding logarithmic scales: https://www.nytimes.com/2020/03/20/health/coronavirus-data-logarithm-chart.html
What we can learn from the countries winning the coronavirus fight: https://www.abc.net.au/news/2020-03-26/coronavirus-covid19-global-spread-data-explained/12089028
(Great explainer on log scales and growth curves explained in the context of COVID-19 in different countries)
This video is a collaboration with Aatish Bhatia about how to see the COVID-19 tipping point - we present a better way to graph COVID-19 coronavirus cases using a logarithmic scale in "phase space" - plotting the growth rate against the cumulative cases, rather than either of these against time.
Support MinutePhysics on Patreon! http://www.patreon.com/minutephysics
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MinutePhysics is on twitter - @minutephysics
And facebook - http://facebook.com/minutephysics
Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Created by Henry Reich
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https://www.youtube.com/watch?v=54XLXg4fYsc